Bracket and method of transposing wires



Oct; 1942- T. P. BREWSTER ETAL 2,299,959

BRACKET AND METHOD OF TRANSPOSING WIRES Filed Dec. 2, 1940 mm gf Ivufen ons.

Patented Oct. 27, 1942 BRACKET AND METHOD OF TRANSPOSING WIRES Truman P. Brewster, Chicago, and Alexander (J. McKahan, Wilmette, Ill.

Application December 2, 1940, Serial No. 368,140

7 Claims.

Our invention relates to an improved point type of transposition bracket (the two wires crossing at a fixed point) and a method or system of arranging the same whereby paired metallic conductors on a pole line may be transposed to efiect a proper balance between other paired wires on the lead and to around, more particularly the wires intended for use in circuits requiring transmission of various frequencies on pairs of wires on the same pole line without interference.

Our invention has for its object the provision of a point type bracket which will permit an arrangement or system of transposing wires on pole lines whereby a more exact balance of the paired wires may be obtained and the effect of capacity and inductive disturbances from adjacent wires on the pole line and capacity to ground minimized, especially when the adjacent or other wires on the line are used for carrying voice and higher frequencies.

Another object of the invention is the provision of a transposition being made at a point by means of a point type transposition bracket, which permits an arrangement of the brackets whereby a pair of wires may be transposed without the necessity of cutting the wires (except for necessary slack) and at the same time enable the wires to be maintained at relatively the same levels without putting a twist in the wires, while maintaining the same relation of the two transposed 1 wires to the other wires on the pole line, Whether said wires are above, below, or on either side of the transposed pair.

A further object of the invention is the provision of a single bracket unit, in which the pins 1 are an immovable and rigid part, thereby eliminating the time and labor heretofore required in assembling the parts by the linemen in the field, with the result that the labor cost of installation and the time required to make the same will be greatly reduced and a material saving effected; while at the same time providing a structure I which insures the proper positions; the brackets being preferably used and arranged in pairs and designated as right and left hand brackets.

The objects and advantages of our invention will be readily comprehended from the detailed description of the accompanying drawing wherem--- Figure 1 is a perspective view of our improved bracket, designated as a left hand bracket; the bracket being shown attached to a portion of the Dole crossarm and one of the bracket pins provided with an insulator with portions of the line wire attached thereto.

. structure involving a base and a pair of pin providing arms rigidly secured at opposite ends of the base with one end of each arm formed to provide what willbe termed the low pin while the opposite end constitutes the high .pin and the two arms reversely arranged so that the low pin of one arm and the high pin of the other arm will be disposed at the same side of the bracket.

The necessity of balancing paired wires on the pole line in order to eliminateinductive disturbances and to minimize capacity unbalance from other wires on the pole line is well known. This balance must be more exact when the wires on the pole line carry high frequency circuits.

The accepted plan in arranging the wires consists in spacing the line wires throughout their distance as closely together as practicable, transposing or interchanging the wires one with the other at regular predetermined intervals and maintaining the spacing between the transposed pair and the other wires on the pole line above, below and at either side at even distances.

The existing plan or method employed for transposing the paired line wires involves the use of a droptype transposition bracket which is attached to the crossarm as a support for one of the wires of the pair under the crossarm, the other wire being supported by the standard pin and insulator on top of the crossarm. This necessitates one wire being passed over the arm and the other under the arm at each transposition point, with the result that a uniform or even spacing of the paired line wires in relation to the other line wires below, above and on either side of the transposed pair cannot be maintained.

In transposing wires with the point type bracket now in use, the transpositions are all made in one direction, which introduces an accumulative twist in the wires at the transposition points; this twist can only be eliminated by cutting one of the wires at the transposition point involving loss of time and expense.

As previously stated, our improved system of transposition which is diagrammatically illustrated in Figure 3 of the drawing involves a pair of brackets as' shown in Figures 1 and 2; the one bracket being intended to transpose the left hand wire of the paired line wires beneath the right hand wire, while the other bracket is adapted to transpose the'wire at the right hand side of said bracket, beneath the wire at the left hand side thereof; (one bracket being designated as the right bracket and the other as the left bracket).

In the particular exemplification of the invention, the brackets--which are of similar construction except as to the location of the high and low pinsconsist of a metal base plate I!) of predetermined length with transversely disposed and preshaped cross bars or arms II and I2 rigidly secured at the ends of the base plate. In the illustration, each bar or arm is shown as preferably made of round stock with the ends bent upwardly and the intermediate portion, to enable proper fastening, flattened as shown at l3, to permit the arm to be rigidly secured to the base plate, as for example by a pair of rivets l4 whereby the bar or arm will be maintained at a right angles to the base plate.

The upper end of each bar or arm is preferably threaded to receive a cob which is immovably secured to the end of the bar or arm as to constitute a complete unit ready for installation.

One end of each bar or arm is bent downwardly beneath the plane of the intermediate portion l3 and beneath the plane of the base plate in as shown at l6, thereby positioning the pin or cob IS on its upstanding end in a lower plane'than the pin or cob IS on the other end of the bar or arm. The bars or arms on each base plate are reversed so that the downwardly bent portions I8 of the two arms will be located diagonally opposite each other and be arranged to opposite sides of the base plate In. For example, in Figure l, the cross bar or arm II at the adjacent end of the base plate H] has the downwardly bent portion It? disposed at the left of the base plate while the other bar or arm l2 at the far end of the base plate has the downwardly bent portion [6 arranged at the right side of the base plate; while in the bracket shown in Figure 2 the bar or arm I2 is located at the adjacent or left hand end of the base plate with its downwardly bent portion l5 at the right side of the base plate (0 and the downwardly bent portion l6 of the bar or arm H at the far or right hand end of the base plate l0 located at the left side of the base plate. The bars or arms II and I2 are identical in construction and are all formed or stamped by a single die, the arms or bars being simply reversed in the order of assembly so that the low pins of one bracket unit are located at the left (at what may be termed the outer end of the unit) and diagonally opposite at the right '(at the inner end of the unit) as shown in Figure 1; while in Figure 2 the arms H and I2 are assembled in reverse order with the downwardly bent portion l6 of the arm at the outer end disposed on the right side of the base plate and the bent portion ii of the arm at the inner end disposed on the left side of the base plate.

cated in dotted lines at IS.

being in accord with a well known standard specification; and according to our improved system or method these brackets are preferably arranged or located in a predetermined order as disclosed in the diagrammatic view Figure 3, where the low pin is indicated by the reference character L" and the high pin by the reference character H.

In the exemplification of our improved method as disclosed in Figure 3--(reading from the bottom of the figure toward the top)the first and fourth brackets at opposite ends of the figure are similar to the one shown in Figure 1, and the second and third brackets are similar to the one shown in Figure 2.

With this arrangement of the brackets at the various transposition points (it being understood that the crossarms and attaching pins of intervening poles are omitted in Figure 3) the wire 2| at the left of the paired wires of the circuit as illustrated in Figure 3 passes from a low point or pin diagonally across the bracket to the other low pin or point at the other end of the same bracket, then continues along the right hand side of the paired lines to the aligned low pin of the next or second bracket (having passed across the cross arms of intervening poles) where it extends diagonally across said bracket to the low pin at the left hand side thereof and at the succeeding transposition point, namely at the third bracket shown in Figure 3 (after passing across the arms of intervening poles not shown but with a gradual rise in the wire) is attached to the high pin at the left hand side of said bracket, thence diagonally across the bracket to the high pin on the right hand side of the same bracket, thence (after passing across the arms of intervening poles not shown) to the high point or pin on the right hand side of the succeeding or fourth bracket shown and diagonally across said bracket to the high pin or point at the left hand side ofsaid bracket. The wire designated at 21', reading from the bottom of Figure 3, passes from a high pin at the right diagonally across the first mentioned wire to the high pin at the left side of the bracket, passing along to the high pin or point of the next transposition point or second bracket, thence diagonally across wire 2| to the high pin at the right (across the arms of intervening poles not shown) until it reaches the next transposition point where it is attached to the low pin at the right of the third bracket, diagonally across the third bracket (beneath wire 2|) to the low pin at the left of the bracket, continuing across the crossarms of the usual intervening poles, to the low pin at the left of the fourth bracket and diagonally across this bracket to the low pin at the right of the fourth bracket,

and so on throughout the distance of the transposed pair; it being understood that the sequence of brackets is repeated by arranging two brackets similar to the second and third at the succeeding transposition points, it being understood that at succeeding transposition points the brackets are arranged in groups of four similar to the arrangement disclosed in Figure 3.

As is apparent from Figure 3, the two wires of the circuit are maintained uniform distances apart at each transposition point and a substantially equal spacing between the transposed wires and all other wires on the pole line provided; the spacing through the distance being as close together as practicable but suificiently apart to eliminate undesirable conditions. The necessity for balancing the paired wires on a pole line, to eliminate inductive disturbances and capacity efiect from other wires on the pole line, is well known and .this balancing must be more exact whenthe wires onthe pole line are used in high frequency circuits.

With our improved bracket construction it will be noted that the transpositions of the paired wires are all madeabove the pole crossarms to which the brackets are secured; that the two wires are maintained at the same elevation on each bracket by passing from a low pin to a low pin and from a high to a high pin thereby maintaining a uniform spacing between the wires and also throughout their distance with the other wires on the pole line as well as to ground, the even spacing between the wires above and below the transposed pair being maintained by arranging our improved brackets in the order mentioned, namely first a left hand bracket as shown in Figure 1; then a right hand bracket as shown in Figure 2 at the second and third transposi tion points; then the left hand bracket shown in Figure 1 at the fourth point of transposition and repeating the order mentioned throughout the distance of the lines.

With the brackets as heretofore employed each transposition turns or places one wire one-half way around the other wire and, therefore, two transpositions produce a complete turn of one wire over the other. In other words, the number of complete turns in the two wires will equal onehalf the number of transpositions installed. Whereas, with our improved method no turns are produced in the wire as there will never be more than one-half a turn between brackets, the wires returning to their original positions at every other bracket or transposition point.

A further advantage results from the use of our improved bracket in transposing wire already in place on a pole line because it will not be necessary to turn the two wires entirely around each other. With the brackets heretofore employed, it is necessary to out out the turns whereas with our improved system of brackets thewires can be transposed without cutting, except to obtain the necessary slack for leveling the previously strung wires.

Our improved brackets constitute two complete weather shedding units whereby the uniform or even spacing between the wires is ensured and the amount of snow and ice loading materially reduced by reason of the cross-sectional configuration of the bracket-arms which permit the attaching cobs and glass insulators to beattached to the ends of the round arms, thus eliminating the use of the usual terminal pins and nuts (for fastening the pins in place and which frequently unscrew and are lost) as employed in present construction. Then too, our improved bracket can be more economically made, as the arms are identical and can be made with the same die, while at the same time requiring less time and labor in installation.

We have shown the preferred method of point type bracket arrangement and of transposing the paired lines of an electrical circuit on the pole lines and also the preferred forms of the bracket units employed for carrying out saidmethod, having described the same in terms employed for purposes of description and not as terms of limitation as certain modifications in arrangement and construction may be possible without, however, departing from the spirit of our invention as defined in the appended claims.

What we claim is:

1. A method of transposing the paired wires of an electric circuit which consists in employing a pair of brackets located on successive support members, each having a pair of low pins and a pair of high pins at diagonally opposite points, with the pins of one bracket arranged to provide a low pin and a, high pin at the ingoing side and a high pin and a low pin at the outgoing side of said bracket, with the pins of the other bracket reversely arranged to provide a high pin and a low pin at the ingoing side and respectively facing the high pin and the low pin at the outgoing side of the first bracket and a low pin and a high pin at the outgoing side of the last mentioned bracket thereby providing two transpositions in the wires without spiralling the wires around each other.

2. A method of transposing the paired wires of an electric circuit which consists in employing two pairs of wire holding pins on the line poles at each transposition point with the pins of one pair extending into a plane above that of the pins of the other pair and the low pins and the high pins of each pair arranged diagonally opposite each other whereby the wires at the incoming and at the outgoing sides of the transposition points will be maintained in their respective elevational planes; reversing the order of pin arrangement at each second transposition point; changing the elevational planes of the wires between the second and the third transposition point from a low pin to a high pin and from a high pin to a low pin, respectively, whereby each wire of the pair, in a given distance, intermediate of succeeding transposition points will successively be disposed at two elevations.

3. A method of transposing the paired wires of an electric circuit which consists in employing two pairs of wire holding pins at each transposition point with one pm of each pair extending into a plane above the plane of the other pin of each pair to constitute a pair of low pins and a pair of high pins, the pins of both pairs being arranged diagonally opposite each other to provide a low pin and a high pin at the ingoing side and a high pin and a low pin at the outgoing side at the first transposition point, a high pin and a low pin at the ingoing side and a low pin. and a high pin at the outgoing side of the secondtransposition point, a high pin and a low pin at the ingoing side and a low pin and a high pin at the outgoing side of the third transposition point, a low pin and a high pin at the ingoing side and a high pin and a low pin at the outgoing side of the fourth transposition point, and then repeating the pin arrangement of the first, second, third and fourth transposition points in the order mentioned throughout the entire circuit, securing one wire of the pair to the low pins at the ingoing and at the outgoing sides of the first and the second transposition points, changing the elevation of this wire from the low pin at the outgoing side of the second transposition point to the high pins at the ingoing and at the outgoing sides of the third and fourth transposition points, securing the other wire of the pair to the high pins at the ingoing and at the outgoing sides of the first and the second transposition points, changing the elevation of this wire from the high pin at the outgoing side of the second transposition point to the low pins at the ingoing sides and at the outgoing sides of the third and the fourth transposition points, and alternating this elevational relation of the two wires between each second and third transposition points of the succeeding groups of four transposition points.

4. A method of transposing an electric circuit which involves two pairs of wire holding pins on the respective crossarms of each preselected linepole with two of the pins extending into a horizontal plane above that of the other two pins, the pins of the same elevation being disposed diagonally opposite each other, arranging said pins to provide a low pin and a high pin at one side of a transposition point and a high pin and a low pin at the other side of said transposition point, reversing said arrangement at the next succeeding transposition point to provide a high pin and a low pin at the ingoing side and facing the high and the low pins, respectively, at the outgoing side of the first transposition point, and a low pin and a high pin at the outgoing side of said second mentioned transposition point and securing one wire to the low pins and the other wire to the high pins at each transposition point without spiralling the line wires about each other.

5. In a wire transposing method of the character described involving a plurality of transposition points on a pole line whereby the two wires of a paired line are maintained in their respective horizontal planes at uniform vertical distances apart at each transposition point, changing the planes of each wire between the second and the third transposition points by arranging a low pin and a high pin at the ingoing side and a high pin and a low pin at the outgoing side of the first transposition point, reversing the pin arrangement at the second transposition point so that a high pin at the ingoing side of the second transposition point will face the high pin at the outgoing side of the first transposition point and the low pin at the ingoing side of the second transposition point will face the low pin at the outgoing side of the first transposition point, with the pin arrangement at the third transposition point being the same as that of the second transposition point, and the pin arrangement at a fourth transposition point being the same as that of the first transposition point, and repeating the arrangement of pins in the order stated throughout the entire circuit, whereby the two wires are returned to their initial positions without spiralling one wire over the other wire.

6. A method of transposing the paired wires of an electric circuit which involves four similar brackets in consecutive order and each bracket having a pair of low pins and a pair of high pins at diagonally opposite points with the brackets arranged to provide a low pin and a high pin at the ingoing side and a high pin and a low pin at the outgoing side of the first bracket, reversing the pin arrangement of the second bracket, maintaining the pin arrangement of the second bracket in the third bracket and the pins of the fourth bracket arranged similar to those of the first bracket, attaching one wire of the paired lines to the diagonally disposed low pins of the first and second brackets and to the high pins of the third and fourth brackets and attaching the other wire of the paired wires to the diagonally disposed high pins of the first and second brackets and to the. low pins of the third and fourth brackets, whereby each wire is returned to its original left or right position without spiralling the two wires about each other, thereby maintaining the same transposing relation between the two wires and efiecting a uniform balancing. I

7. A method of transposing the paired wires of an electric circuit which consists in employing a plurality of similar brackets each having two pairs of wire holding pins on the line-poles at each transposition point with the pins of one pair on each bracket arranged in a plane above that of the pins of the other pair with the pins in the same plane arranged diagonally opposite each other and the order of pin arrangement of the second and third brackets being reverse to the order of the first and fourth brackets, securing the left line wire of the pair to the low pins of the first and second brackets and to the high pins of the third and fourth brackets, securing the right hand line wire of the Pair to the high pins of the first and second brackets and to the low pins of the third and fourth brackets,

whereby each wire is maintained in level posi- CERTIFICATE OF CORRECTION? Patent No. 2,299,960. October 27, 191m.

' TRUMAN P. BREWSTER, ET AL? It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, second column, line 14.5, for "point" read --points--; page 14., first column, line 15, claim 5, after the word "points" and before the period insert I -whereby each wire is returned to its original position without spiralling the line wires about each oth and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed and sealed this 26thday of January, A. D. 191;}.

Henry Van Arsdale, (seal) I Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION. I Patent No. 2,299,960. October 27, 1914.2.

' TRUMAN P. BREWSTER, ET AL.

It is hereby certified that error appears in the printed specificetion of the above numbered patent requiring correction as follows: Page 5 second column, line 145, for "point" read --points--; page 14., first column, line 15, claim 5, after the word "points" and beforethe period insert whereby each wire is returned to its original position without spiralling the line wires about each othv and that tl'n said Letters Patent should be read with this correction therein that the some may confonn to the record of the case in the Patent Office.

Signed and sealed this 26th day of January, A. D. 191,6.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

